Mrs.Lunnah has a jar of beads. There are 30 red beads, 30 blue beads and 30 yellow beads. If a student sticks her hand in a jar and pulls out the beads, what is the probability that is will be blue?

Siku has husky dogs in many different colors.  He has 12dogs in total. A third of them are cinnamon and white . A quarterof them are red and white. The rest of them are gray and white. How many of huskies are gray and white

For a grid of 10 lines and 10 columns. Two children and children coloring boxes, each one a color in three colors: blue, red, purple. Credit: "Every time we finish the cells there are two lines on the two lines that have a color number of this cell line by the number of cells in the other." Nhi said: "I discovered there are always two columns are painted like that."
Come on, tell who is right, who's wrong?

a bag contains green marbles and red marble and red marbles only . If the ratio of the number of green marbles to the number of red marbles is 1:4 then............% of marbles are green

In the library,  9/20 of the books are textbooks . 7/20 are story books and the rest are teacher's books . What percentage of library books does the teacher's books account for? 

We can't see you.What are you wearing?
I'm wearing a blue skirt and a red scarf
Ai dịch dùm với
Mk kick cho

A bag contains indentical balls of different colours.There are 12 red, 10 white, 8 yellow, 3 blue and 2 black balls.Without looking into the bag,John takes out the balls one by one.What is the least number of balls that John must take out from the bag in order to have at least 4 balls of the same colour?

2/5 of the number of books in a library are comic books what percentage of  the book are comic book

A bag contains green marbles and red marbles only. If the ratio of the number of green marbles to the number of red marbles is 1:4 then % of marbles are green.